[Live-devel] What's the DirectedNetInterface used for?

[dai jun]

I'm reading the groupSock source code these days.I found
DirectedNetInterface is a pure abstract class,
In groupSock::outputToAllMemberExcept(...), the member functions are called,
but I cannot find any implementation in the project.
I wonder what's this class used for?
I guess it can be extended and used for stream forwarding? or application
layer multicast?

Daly
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